How do I erase my old Apple Watch?
How do I erase my old Apple Watch after setting up a new Apple Watch? Can I do it from the watch itself?
Apple Watch Series 6
Unpair & erase an Watch -
Unpair and erase your Apple Watch - Apple Support
M1 Mac mini, macOS 13.2.1; Watch, series 7 GPS/cellular, watchOS 9.3.1; iPad Pro 2nd Gen, iPadOS 16.3.1; iPhone 12 Pro, iOS 16.3.1; TV 4th Gen, tvOS 16.3.2; HomePods, audioOS 16.3.3 and Airport Express w/ Airplay 2